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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0179e3cc84bea23f263ab4ba27dc4ab6a919274309bed97c0233cde08da2ab' 
  AND token = 'oJhw+l4WJ5cpjDySYA/Oe89kQ1Se1NtOvhjSfzlrBxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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