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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97687605275f51e2329876d54f5f9d8b416b7ddf1296ed94630a81743112d1f' 
  AND token = 'ZKdaiwr46X79Kq/laPH+dPUVIjn2QrtLeQs0drFUYA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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