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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e237a89555726389c07bb0b65dc61bb0a61bbc4c7efa7f0f96e6caf8c765d939' 
  AND token = 'FgIpM3QrumO1GGp4vEt/dVY4Z7ifod39Zf2a7w6V/5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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