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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2388e763414d7fe8855b3db65f2f01d597b8c16fac807a2ec29a042a894f1d' 
  AND token = 'xKxe0edN+5OQCGI6/p0d9DL3i7SKJrViMruX483QCvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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