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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bc144da4aac86d50a39c0a46cdb4ac31be52dcf253968a79c38d18442d6771d' 
  AND token = 'AvtAPa5ee16CWECocdqe2CDa2xU2ilDP2zruqLgZe44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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