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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c4bdc01c1f8ae8bb1413deeaedd98a4d86d6cd4466832feddac53bb19dc08da' 
  AND token = 'pDg9qsYS0kS53izuvGFIexRFyeonCunKiUVcjt4Wp1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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