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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ae24f9a1d2ba528975b127433d82c96a503243817397e4b2a787143a902f47' 
  AND token = 'zeb5nlRdepAx8DFZ+IwJThX0+YGpd11ieAzCUEp7/Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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