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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fbdcce7dc2083e6ab4a1385b4853f5cbc41532c385fb936485aeb6eaa744cdb' 
  AND token = 'yNYCMpviUNAjbKqxzjE1A9Prud2CAEWGniSL+4p8U4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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