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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd383e715bb5cbc2f1c277c26e9a8c144b259b551ea4bf2aea852c0249be9ab49' 
  AND token = '3K68bOJpG6UajjMyh9+XYv1tOpbFYjhBOu8D0kvxcy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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