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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d1bded121c42cbef670992e579c0970c062e6b9cc8d3e8ebba4f9aaf01f574' 
  AND token = 'PDOJPgytb9saMB4ZebkZDGNmUBKpkoHkq1gabpID9oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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