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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6063625698966b4beb7eb8335fc7eee0a44a45caf94b829d3983b4b6f4fa29' 
  AND token = 'KXGmEIDHkWi/jXkjc6eRZ3Isy0wIMzBfgZyrf3qy0bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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