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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a7a88b288f2ca19034e5987d6b3f80578cd35d26e8bd6dca3e329bff06bbbe2' 
  AND token = 'iBkjMw7syoML4pTqIfMcqcy7t4nImInYLjrfmWm4Oro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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