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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b266dc8950498571b1d03e491fd0cc358b853aa42f62defd67e72fff43aef7d' 
  AND token = '4GPIdOl5rdifAOD9/mllwSX+Mko7U5tm5ulK6OVtQ/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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