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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2bb540200c074be7c215cd6ae7cc44413eea256e1c94c49cb14288881613cbc' 
  AND token = 'ZsGIhjEQs+j3S4wuFxz8kU5ckyzHf5KWXqin4nndTuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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