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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff014f31271dd1c30cea5f830bf7589655d843268cd78536872a96fc6f04a49' 
  AND token = 'dGBnvUwpRTfEf66koCrg5t6q5VXelyRGdriSAPTAYyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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