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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8760de007691987963a1edc35ce48b40008fe28b823bfd4a83c9ada006a06538' 
  AND token = 'eu9Ik4pXmdoCU29oS0RwV/Z8KWRDagNNmRRSyh9CNMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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