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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3305f2c67d85adc28de99eba9839a17cfeb485ff546212c8f640a65a5f49433' 
  AND token = 'U04eDXCcgPyKHCvbOyjEecFKW37GMxwlwez7Az2eWGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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