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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '168c5ed585ca0c9090bcdf61af3a47075b56599f575a458a6f8bf70c68981df2' 
  AND token = '2wXQJX3JoVpuDg+VcvVar87KXvb8s7k69JZGy19Pns8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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