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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6775b9e258645b587fcf0f0df387a0a668b34a6aa2ebca181b34b293955c4a61' 
  AND token = 'y8zhTQiliITOoOccW86wK+2GsQtn+skeVaDEgSBd5b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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