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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc2e8646bd1ef0c94e9c47fc37ea00cfb81749ecf70a5f9715cf6a5e104bc204' 
  AND token = 'SSA4DEwn1rL2bEvezqrl4hFB/jOXzN93LPT89AKyvUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}