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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cfbbb3c92b6f18077a9f9b6950b6df3ffaab235ef11205c3b986ca2b9b17619' 
  AND token = 'jlLorqnUJV/Y8aNn7xC5MPULPuSfGpy+WqCHRVr6+/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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