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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d92af2bb0e4f9bafa72c18040b7fdbdff9702cf2d35aef040925d316d4d746' 
  AND token = 'Su0ZaQfIGhPAXGDyt+Zs0odWPgiYpCU0RIonz2TpWgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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