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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f02a24a9b24ef4e585ae6e2cf9fd565ee2714c03f35ea12f3640608f0314f6d' 
  AND token = 'MavpQzQQvNUMAUYk+vDXlcV4pHU/at5T348ZyhraJdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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