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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67dae72881acc614e7fc2ed6fbcc7394d0a8440b059ce417d6941099220a945c' 
  AND token = '9qWUy4IMlKJxFy4SyI0aQlZ0TsaogUwAdwDV7LnXrTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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