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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b91ee4ad0e1f9d0e4f284c0961b71b6ab15febad6b9c4dc641d66efe003da3f' 
  AND token = 'SsuJqVXEUaCtJbthli6tnTt4Gm0t/vKIiM8Bl5V1clQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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