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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa7b273f5078da2d5b603f1ad25d92942149f6cdb5f6dc5f36e89dfdae5bbde' 
  AND token = 'V2ctH/BIjh9uWTK9US8NnTeijjlYAxMo88frcJfj1ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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