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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c8c45edda53d48b404b5944977d2304921b21fff6c18189f74e0bd57631c451' 
  AND token = 'wR5Z8+Cro9r5KYd1uL9M8KOUoitrCz4BbQsAHwlbRfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00368

JSON explain

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