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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa1e112406ebc5c0e2a07c54d1ac5aeb0cbf52450b0111e5c20d63fb3faf28c' 
  AND token = 'DXVu6milCDkihdq1MYoxALx/IVnQ4rTfeMPiwt7wV0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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