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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92a3ee97e4c999419ab41b5a951f802247e386c6bd12949dd4471b66714f0dc' 
  AND token = 'D2T4oGg8zZqCoOjNG1IWSu7jGzRhoa5UWIEaNEqHB/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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