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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa7eda72018b0068e8434fbf7a9822b9d771c4d77ed7dba08237ba68928df01' 
  AND token = '5h6DLQ9cJ5hnttuZAi9PovJMbXlfpyg7/yRt1eXQk6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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