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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d429b37d83d1103bc77a92e73c10191167870a544b0a9ff7200b1c649914615' 
  AND token = 'Fsq3sMDFZavkLud8nG9AjbfWwND+l4Gwp0rn+7g1TP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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