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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43184a5aeb7ca8ec437e1947217aa706e8e757adbab0d720a4040a43554491e4' 
  AND token = 'LYD/AC7pPXZ1guw4Oat8NAc/Z4akmBO7ONRH0sSyw0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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