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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '898f54adebd43e67f428741c262728984fe7e1fad294202d6e0453a448b88f5d' 
  AND token = 'z+ZnZCqzb4ezpSjXEvGMxJmapvamdcCvxv2TwTzmGz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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