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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '590cfe714b1720df333941ef3db11aca6d1cda6cc0d567716640c71cdd6c507e' 
  AND token = 'WJrlncQ+WTxcYHRBK+fuWev2wCll/HLxGd1G/4M0yEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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