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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9634a91ef942913c587d0715f35ab3908e696a7a776df7a89472d37168d6fde4' 
  AND token = '3Jhbia8jX91xudXBEt+POErHHkgSkLf0BOlGMY8YCS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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