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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d9a08388b136c5ee705406ed032ee92d8a2a2110547b06f64f4716c25d0ef71' 
  AND token = 'oBXe9k9bCQkvACfNvNJL721Ko2q7Yzj5DDc/GIkSc0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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