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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef6264b8fcb5ec88e95c75031bac5ac0d750fdef85f897de8ee1f0bb60bd8fc3' 
  AND token = 'i5Aa9YJeodBUScuxtbXGVNclA+p4SvBPssJ3SouA8d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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