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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa9385bf3a0f795783c63e5091bf104173c39778ebf1a575bd307800ea377a9' 
  AND token = 'X7G0K4BTPbtglfjE5M8/TUkjOr2klRwZq7djuBUGUlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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