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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dbe478ce9dc5acbe21ce75728206f1e7f01abaf095f84fa056790d3c7bd0cea' 
  AND token = '6XO+Ye8yxXRyqB43COCQkkJes/FQeKhN4HugfQ7NSGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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