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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbb893ef936ea90cb19568acf882ce7681d1945a470450624ea20fd7e58bf2f1' 
  AND token = 'xS3u8FNFqwj2A0VwWyXs+/H44tzKKkBwWBe60mr7BSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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