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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1770bccd65a088748fe9d2b21ff1e0bb8859dbe5cc9b51a30406e1579b0743f8' 
  AND token = '6RBfRkdR7sbbmvrlwHInhbqLo6uukKDNoDnfnBJ2v40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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