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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '978671db9db2f36ce87c0c1011dbd7088209a6afceb48f122baaf669c3cb4a4c' 
  AND token = '8V8r72yR8c/NV9Eeo8lC3O45+mhAO9yNdDuY2qEZPpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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