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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f042688cd36efe653a7e393887c63c265f9e86978343678411b891fee11a564' 
  AND token = '07W7cBIJhq+KtE4cbP+aW5igW7UUs7veytzlnby1Lq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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