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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad821f6f1df40b810e699a31a6ebd1a68096fa0b5cf8cdb27e0b13d8a93a3576' 
  AND token = 'bz7XB/3MGRP2L/ebZc4ZUgQwQu7xtqGAoOfcGe0j1lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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