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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '899d7121aaa947a342c4d295cacd067218aef924f289643f770616d9bbdba6a1' 
  AND token = 'pRUv0dDGKwx1KvAVu7L3mQ6urSjbTXkgw7Z7bwWNTEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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