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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65be3813bfcb023250a42760769407e07ac9b67eef644e57b940ba09d241cc25' 
  AND token = 'VoEFQP3UlZwSRkfKh6JMvfjp0C1DcbdrJl1x8tQHIDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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