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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7004c10fecd0ac8a46c45e7e24ec7da11c9e5ef5ac5b52f6f92dc549df90f6df' 
  AND token = 'OJhnkurzMEzxv3TL4pliM8iKHB2hvBuTZg927cD1bO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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