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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c51307d2889159b541978b7626305b78dd2e314a7237697ada1f5f2ddf7b7c' 
  AND token = '9iHaTMwrVUtK2PTaRJCYtvcOlEMwR4DJ7JspAxpX400=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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