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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '595ee7488855c44fa02e156d74016a9dbdad8c4d8cd73ef3d391364d3ad8fec8' 
  AND token = 'oRKIPj+aJk/QJ+imLZrdBlLa9l/ckAO2ZqcBiRF6hn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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