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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c83308fef0209ec9562780cea26ee06511c350cbbf218b17acb62d829aa448' 
  AND token = 'D6DGzcPMFp+BXdxl1zRIl5EbehNwzmyVr20XSvi7MsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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