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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e467a816056ccfe346c269d065567a6aa5b179bbd5555939e9ebcc51914bf4b' 
  AND token = 'dHYB85/MJ2/wjSEEJyE0mI19vYp6Y1SoWNh6P/k1uHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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