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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9354ea66c900bb770cadbb55e7db2f3b3b84309c04f902fb73ea5e5a9ef6039' 
  AND token = '25PqD6pJsGIyQM6fqZvzWZwvhZgdRu2zpFgRe2OgDtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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