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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd82636f37c35e2d077b4b5ca7b2400f092c324aba5223034e5712e8ad742b69' 
  AND token = '0yiSv497Eb15e7nhybD00IbiHI0JkxnuntDGMqizQWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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