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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2a2ccb5b0eba9b6b8f9cac6102c0dcb56bcbab877038417f76b7cda11444d1d' 
  AND token = '3cUmEInBuLX/7ratZW6Ej+l61IdQPVgpnsYtm0GHMR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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