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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e88ff54dd54c1c7cdcaefd5328975e720c506fa1dbe1ea1caacdd7addca2fc' 
  AND token = '9UosRRR6L5MM6OGKdfn58Qqqg9wQBIYK4h5ubR0xabQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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