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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c818b772479c0b1a1cce5a2cb58135f232ee661e66cdc1def2bb498c79aa4ac' 
  AND token = 'T+kZUq5Lpf/2hmRHylKSxa2kv30NP2VDykZV+tywHPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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