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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8295c1c6b035cf8825cd9d1568f077a3c4902558d56d3a832bccbbe798ec2be' 
  AND token = 'jFLxJ5mPhNmoF1RRg1Ngzqojd3ZU0br4mwtqgkMzRPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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