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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e9ba6242d8146c03cf6276e53cd561bd2c42bb368de3190179979a0d6e37b1d' 
  AND token = 'iplYjsJnnxiN8X/aVtiPPSw3oQo3wPlwssnfsJPaFd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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