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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28c98d7dd604ba68d0d0c6a13dce4eda315a80c4a5ff600f61486f50b5ef455d' 
  AND token = 'HfGz+ZTjpQjDCbg8s+eUz4h37q39REcgYruJSgj4gkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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