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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5d26e236244ff90fb872ea04c17b55fe39b777a6be4f06b28ea47d09100d611' 
  AND token = '4vGf8kfp/g3xBZsaahi24PX89WYk7YWvSzda3GjTEDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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