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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c5cccdd831f57403d10a603e24e27c5331f138b9b7362ac6e47bc7d00a673b8' 
  AND token = '5VSIhrDY8q1VznayelxS3ZKGzcAdXDZkQs86BWvqYIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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