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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97ee6b749cc84cc2541d6b5ab71fe3f0d9bc8b8b73504eb20bb6157fd82016a' 
  AND token = '/40QK5sIYDbHURLrnmsXASHRY7h2XXop5nkp409zOZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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