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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'babd561adeb0205c0f3ffc99525102e0d30882105a4310328137739bda5d1b2a' 
  AND token = 'V2drdDUo+TWJbu446/nuGjmnszDXa92e0hmCpq9xCgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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