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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e71874e0fc85cf3ba0ab9d848c241614ceb17173885a2159f223cf9c3d1359c' 
  AND token = '5N/W0DyDq+D/sRcPecS+9X6EWUS5EOdJo0rJgyUNvdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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