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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4dd8ca16d0850270190422bfe36123f8ebf96e674c039019bb8bd1971e2efe1' 
  AND token = 'UJxAwKZEf17TYm3rF/lF44vAE96aPc71bkCawk4moXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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